French fort on left bank of Ottawa river (north side) between Grand Calumet and Allumettes islands - stockaded fort erected about 1680 or earlier. The family of Louis d'Ailleboust, Sieur de Coulonge, traded with the Indians on the Ottawa river from 1670 to 1760 and erected several trading posts of which fort Coulonge was one. After the cession of Canada this post was deserted by the French. Alexander Henry Sr., one of the first free-traders, passed this fort 1761 and states that it was deserted at that time, "a trading fort surrounded by stockade, built by the French". Harmon was there 1800 and mentions the fort. It was soon operated by the North West Co., who rehabilitated many of the vacant French forts which had not been destroyed. The Hudson's Bay Co. after the coalition 1821 took over this fort and operated it until about 1865. It appears on the Arrowsmith map 1832 (No. 101), 1857 (No. 8) and 1854 (No. 77) but is not included among the Company lists later than 1869. It was visited by Governor Simpson in 1841 when on his famous trip. McLean in his "Twenty five years Service" speaks of being there in 1822-23.